蒙古栎伴生种及邻体物种多样性的研究

采用点样地法对四个地点蒙古栎树种的邻体多样性进行了研究，结果表明，随着调查样点数的增加，蒙古栎邻体的物种丰富度和Shannon -Wiener(H′）物种多样性指数逐渐增加，最后趋于一固定值。用物种共同出现百分率测定了蒙古栎与其伴生种的种间联结值（PC值），并引入LS值来测定单株蒙古栎相邻物种的平均个体数目，结果发现，不同地点蒙古栎邻体多样性不同，其相邻乔木和灌木种类也有较大差异，联结系数各有高低，比较PC值的大小，得出了蒙古栎的主要伴生乔木和主要伴生灌木物种（结构和组成）。物种（乔木和灌木）与蒙古栎伴生的原因主要是相似的环境需求和互惠互利，说明蒙古栎处在不同的群落演替阶段。

Neighbor diversity and interspecific association of Quercus mongolica

Neighbor diversity and interspecific association of Quercus mongolica were studied through point sample method. With the increase of plots number, species richness and Shannon-Wiener (H') diversity index increased. At last they came close to fixed value. LS value (average number of neighboring species) was first introduced in this article. Different sits had different PC value (value of interspecific association). According to PC value and LS value, accompany tree and shrub species of Quercus mongolica were determined. The similar environmental requirement and mutualism were the main reason why they live together. The result of interspecific association between Quercus mongolica and other species in 4 locations was analyzed. The reason why the differences existed was that Quercus mongolica studied was in different succession stages.